I highly doubt it too. I would be willing to bet it actually needs 2-3 steps down. Carbs are always severely over jetted for liability concerns. You won’t know exactly where it is until you install air fuel gauge. I used to rely on reading plugs. But, Ive found the air : fuel ratio can be very rich even when the plugs don’t necessarily show that. I thought my car was running very good by upsizing the jets from where it was jetted when it was shipped. I found after a gauge it actually needed 3 steps down on jets. Makes a lot more power now.
